1、Performance Requirements forDual Check Valve Type Backflow Preventers for Carbonated Beverage Dispensers, Post Mix TypeAmerican Society of Sanitary EngineeringASSE Standard #1032-2004(R2011)ASSE Board Approved: July, 2011 ANSI Approved: August, 2011 An American National StandardDual Check Valve Type
2、 Backflow Preventers for Carbonated Beverage Dispensers, Post Mix Type iASSE 1032-2004(R2011)General InformationNeither this standard, nor any portion thereof, may be reproduced without the written consent of the American Society of Sanitary Engineering.Instructions for receiving authorization to di
3、splay the ASSE Seal are available from ASSEs International Office. Organizations wishing to adopt or list any ASSE Standard should print the ASSE Standard number on the cover page first and in equal or larger type to that of the adopting or listing organization.American Society of Sanitary Engineeri
4、ngWestlake, OhioCopyright 2011, 2004, 1980All rights reserved.ii Dual Check Valve Type Backflow Preventers for Carbonated Beverage Dispensers, Post Mix TypeASSE 1032-2004(R2011)Dual Check Valve Type Backflow Preventers for Carbonated Beverage Dispensers, Post Mix Type iiiASSE 1032-2004(R2011)Forewor
5、dThis foreword shall not be considered a part of the standard. However, it is offered to provide background information.ASSE Product Standards are developed in the interest of consumer safety.The American Society of Sanitary Engineering is dedicated to the preservation of Public Health and Safety th
6、rough “Prevention Rather Than Cure.”Prevention of contamination or pollution of potable water in plumbing systems, which is one of the major objectives of the Societys Standards Program, is addressed by the development and promulgation of Standards embracing performance criteria for manufactured plu
7、mbing components designed to safeguard public health and safety.The recognition of probable sources or causes of contamination or pollution of a potable water system, whereby it becomes unfit or undesirable for human consumption, is vital to the maintenance of the systems continued potability.While
8、backflow into potable water lines is always a potential source of contamination, in connection with Post Mix Type Carbonated Beverage Dispensers, backflow of CO2 gas into copper piping of the potable water system, causing copper carbonate poisoning, is especially serious and must always be protected
9、 against.This standard is focused on those devices known as Dual (Double) Check Valves, which are one type of device recognized for backflow protection for use in connection with Post Mix Type Carbonated Beverage Dispensers. In addition to the inclusion of this device in the system, periodic inspect
10、ion and servicing of the device is essential.This standard is the latest addition to ASSEs current backflow prevention device standards, each of which cover a different type of backflow protection device; each tailored to the protective requirements essential to the specific system conditions in whi
11、ch it is installed and the degree of hazard involved.Recognition is made of the time volunteered by members of the working group and of the support of the manufacturers who also participated in the meetings for this standard.This standard does not imply ASSEs endorsement of a product which conforms
12、to these requirements.iv Dual Check Valve Type Backflow Preventers for Carbonated Beverage Dispensers, Post Mix TypeASSE 1032-2004(R2011)Compliance with this standard does not imply acceptance by any code body.It is recommended that these devices be installed consistent with local codes by qualified
13、 and trained professionals. It is recommended that these devices be replaced periodically per the manufacturers instructions.This standard was promulgated in accordance with procedures developed by the American National Standards Institute (ANSI).Dual Check Valve Type Backflow Preventers for Carbona
14、ted Beverage Dispensers, Post Mix Type vASSE 1032-2004(R2011)Joseph FugeloProduct Standards Committee ChairmanLabov Co. Wholesale Dist. P&HPhiladelphia, Pennsylvania Rand AckroydRand Technical Consulting, LLCNewburyport, MassachusettsWilliam Briggs, Jr.MGJ AssociatesNew York, New YorkMaribel CamposI
15、APMO Research & Testing LaboratoryOntario, CaliforniaJudson Collins Julyco ProfessionalsMannford, OklahomaRon GeorgePlumb-Tech Design & Consulting Services, LLCNewport, MichiganSteven HazzardASSE Staff EngineerWestlake, Ohio Charles HernandezSpears ManufacturingBollingbrook, Illinois2011 Product Sta
16、ndards Committee John F. Higdon, P.E.Apollo Valves / Conbraco IndustriesMatthews, North CarolinaChuck LottPrecision Plumbing ProductsPortland, OregonPeter MarzecPearl River, New YorkHamid NaderiICC-TexasAustin, TexasBrad NollWilkins / A Division of ZurnPaso Robles, CaliforniaThomas PitcherelloBorden
17、town, New JerseyShabbir RawalpindiwalaKohler CompanyKohler, WisconsinDr. Tsan-Liang SuStevens Institute of TechnologyHoboken, New Jerseyvi Dual Check Valve Type Backflow Preventers for Carbonated Beverage Dispensers, Post Mix TypeASSE 1032-2004(R2011)Table of ContentsSection I . 11.0 General . 11.1
18、Application 11.2 Scope . 11.3 Limitations on Design . 11.4 Reference Standards 2Section II 32.0 Test Specimens 32.1 Samples Submitted 32.2 Samples Tested 32.3 Drawings 32.4 Rejection 3Section III . 43.0 Performance Requirements and Compliance Testing 43.1 Hydrostatic Test of Complete Device . 4Figur
19、e 1 43.2 Deterioration at Extremes of Manufacturers Temperature Range Test . 43.3 Endurance Cycling Test 5Figure 2 53.4 Hydrostatic Leakage Test of Check Valves 6Figure 3 63.5 Drip Tightness of Check Valves Test 73.6 Allowable Pressure Loss at Rated Flow Test . 7Section IV 84.0 Detailed Requirements
20、 . 84.1 Materials . 84.2 Instructions for Marking and Installation . 8Section V . 95.0 Definitions . 9Dual Check Valve Type Backflow Preventers for Carbonated Beverage Dispensers, Post Mix Type 1ASSE 1032-2004(R2011)Dual Check Valve Type Backflow Preventers for Carbonated BeverageDispensers, Post Mi
21、x TypeSection I1.0 General1.1 ApplicationDual check valve type backflow preventers (for carbonated beverage dispensers, post mix type), herein referred to as “device,” prevent carbon dioxide gas and carbonated water from backflowing into the potable water system which supplies the carbonating unit.
22、These devices operate under continuous or intermittent pressure conditions.1.2 Scope1.2.1 DescriptionThese devices consist of two (2) independently acting check valves internally force loaded to a normally closed position and designed to operate under intermittent or continuous pressure conditions.T
23、hese devices shall be permitted to be equipped with a supplementary check valve installed downstream of the independently acting check valves.1.2.2 Size RangeThese devices shall be designed to accommodate or inch (8 or 10 mm) nominal pipe sizes.1.2.3 Minimum Working PressureDevices shall be designed
24、 for a working pressure of not less than 200.0 psi (1379.0 kPa).1.2.4 Temperature RangeDevices shall be designed to operate at temperatures of 33.0 F to 110.0 F (0.6 C to 43.3 C).1.3 Limitations on Design1.3.1 Flow CapacityThe device shall meet the flow capabilities at the pressure drop specified in
25、 Section 3.6.1.3.2 Structural StrengthAll parts of the device shall be designed to withstand, without permanent distortion, the stresses developed by the specified hydrostatic test pressure, as well as the stresses resulting from a specified water working pressure coincident with operation under a s
26、pecified unbalanced pres-sure condition.2 Dual Check Valve Type Backflow Preventers for Carbonated Beverage Dispensers, Post Mix TypeASSE 1032-2004(R2011)1.3.3 Mechanical Function1.3.3.1 Threaded ConnectionsFemale pipe threaded connections shall be so constructed to prevent pipe penetrations from re
27、stricting the flow through the device or interfering with working parts.1.3.3.2 Repairabilitya. The internal parts of the devices shall be accessible for inspection, repairs or replacements.b. All replaceable parts of the assemblies of the same size and model shall be interchangeable with the origin
28、al parts.1.4 Reference Standards ASME B1.20.1-1983 (R2006), Pipe Threads, General Purpose (Inch) ISA 75.02.01-2008, Control Valve Capacity Test Procedures SAE J513-1999, Refrigeration Tube Fittings General SpecificationsAmerican Society of Mechanical EngineersThree Park AvenueNew York, NY 10016-5990
29、http:/www.asme.orgInstrument Society of America67 Alexander DriveResearch Triangle Park, NC 27709 http:/www.isa.orgSAE International400 Commonwealth DriveWarrendale, PA 15096-0001http:/www.sae.orgDual Check Valve Type Backflow Preventers for Carbonated Beverage Dispensers, Post Mix Type 3ASSE 1032-2
30、004(R2011)Section II2.0 Test Specimens2.1 Samples SubmittedThree (3) devices of each model and size shall be submitted by the manufacturer. Tests shall be performed in the order listed on one (1) device of each size submitted.2.2 Samples TestedThe testing agency shall select one (1) of each model an
31、d size for the full test.2.3 DrawingsAssembly and installation drawings and other data which are needed to enable a testing agency to determine compliance with this standard shall accompany devices when submitted for examination and performance testing under this standard.2.4 RejectionFailure of one
32、 (1) device shall result in a rejection of that model and size until the manufacturer has corrected the fault and submitted new devices for testing.4 Dual Check Valve Type Backflow Preventers for Carbonated Beverage Dispensers, Post Mix TypeASSE 1032-2004(R2011)Section III3.0 Performance Requirement
33、s and Compliance Testing3.1 Hydrostatic Test of Complete Device3.1.1 PurposeThe purpose of the test is to demonstrate that there are no leaks or indications of damage when the device is subjected to a hydrostatic pressure of two (2) times the maximum rated working pressure as designated by the manuf
34、acturer or 400.0 psi (2757.9 kPa), whichever is greater, applied at the inlet.3.1.2 ProcedureThe device shall be installed per Figure 1. Purge the system of air and pressurize to the test pressure of two (2) times the maximum rated working pressure as designated by the manufacturer or 400.0 psi (275
35、7.9 kPa), whichever is greater. Hold for ten (10) minutes. Observe for external leaks or other indications of damage.Figure 1Ring PiezometerShut-off ValveGaugeSupply ValveCheck Valve #2Check Valve #1Shut-off ValveDual CheckMinimum five (5) diametersof straight pipeApproximately ten (10) diametersof
36、straight pipeRing PiezometerThrottling ValveGaugeFlow MeterUpstreamTee (See Figure 3)Piezometer to be installed per ANSI/ISA S75.023.1.3 CriteriaAny leakage shall result in a rejection of the device. Any damage that prevents compliance with any part of this standard shall result in a rejection of th
37、e device.3.2 Deterioration at Extremes of Manufacturers Temperature Range Test3.2.1 PurposeThe purpose of this test is to demonstrate compliance with Section 1.2.4 of this standard.3.2.2 ProcedureInstall the device in a test assembly capable of continuously circulating water at 1.0 GPM (0.06 L/s) th
38、rough the device. Water at the maximum rated working pressure as designated by the Dual Check Valve Type Backflow Preventers for Carbonated Beverage Dispensers, Post Mix Type 5ASSE 1032-2004(R2011)manufacturer and temperature of 110.0 F (43.3 C) shall be circulated through the device for eight (8) h
39、ours per day for a total of eighty (80) hours. At the option of the test laboratory, the test shall be permitted to run continuously for eighty (80) hours. Then within one (1) minute of the conclusion of the eighty hours, water maintained at 33.0 F (0.6 C) shall be circulated through the device for
40、at least one (1) hour. Upon completion of the cold water cycle, allow the device to reach ambient temperature. Repeat Section 3.1 of this standard.3.2.3 CriteriaAny leaks shall result in a rejection of the device. Any damage that prevents compliance with any part of this standard shall result in the
41、 rejection of the device.3.3 Endurance Cycling Test3.3.1 PurposeThe purpose of this test is to verify the operation of the device after a simulated use of five hundred thousand (500,000) cycles.3.3.2 ProcedurePrecondition the device by submerging the device in 180.0 F (82.2 C) water for twenty (20)
42、minutes. Install the device per Figure 2 with S1 open throughout the test. One cycle shall consist of the following:a. Open S1 and S2 to flow water per section 3.6.1 of this standard at a temperature of 110.0 F 4.0 F (43.3 C 2.2 C) at 75.0 psi 1.0 psi (517.1 kPa 6.9 kPa).b. Close S2, then immediatel
43、y open S3, and increase the backpressure to 200.0 psi (1379.0 kPa) or the manufacturers maximum rated working pressure, whichever is greater.c. Close S3.Repeat for 500,000 cycles. The time for each cycle shall be a minimum of two (2) seconds. The test setup shall be such to prevent water hammer or b
44、ackpressure spikes above 200.0 psi (1379.0 kPa).Figure 2Device on TestSolenoid Valve - S3 Solenoid Valve - S1Solenoid Valve - S2At the conclusion of the cycle evaluation, the device shall be tested to and comply with the remaining sections of this standard.6 Dual Check Valve Type Backflow Preventers
45、 for Carbonated Beverage Dispensers, Post Mix TypeASSE 1032-2004(R2011)3.3.3 CriteriaThere shall be no leakage from the atmospheric port when tested. After completion of the endurance and cycle test, the device shall be tested to and comply with the remaining sections of this standard.3.4 Hydrostati
46、c Leakage Test of Check Valves 3.4.1 PurposeThe purpose of this test is to demonstrate that no damage or leaks occur when a pressure of 400.0 psi (2757.9 kPa) or two (2) times the maximum rated working pressure as designated by the manufacturer, whichever is greater, is applied to the downstream sid
47、e of each check valve individually and the pressure on the upstream side at atmospheric.The supplementary check valve, if so equipped, shall be held open or removed during this test. 3.4.2 Procedure - Upstream Check ValveInstall the device per Figure 1 with a sight glass, shut-off cock and drain coc
48、k (figure 3) installed in the tee upstream of the inlet check valve. Hold the downstream check valve partially open (fully clear of its seat). Purge the device of air, close the supply valve, open the shut-off cock to the sight glass. Adjust the water level in the sight glass to be at a height not l
49、ess than that corresponding to the top of the water space in the device. Raise the pressure downstream of the check valve to 400.0 psi (2757.9 kPa) or two (2) times the maximum rated working pressure as designated by the manufacturer, whichever is greater. Record the water level in the sight glass. Hold for not less than five (5) minutes. Record the water level in the sight glass. Observe for indications of damage or leaks. Any rise of water level in the sight glass is an indication of leaking. Figure 3Sight GlassShut-off Coc
